A method for a 3D printer is provided. The 3D printer includes a print head defining a filament channel with a first end and an opposite second end for filament melting, and the filament channel is formed by joints of multiple print head components with seams; an extruder for feeding filament into the channel from the first end and extruding molten filament from the second end; and a filament cutter arranged between the extruder and the print head. The method includes: cutting the filament into a first filament segment outside the channel and a second filament segment partially inside the channel; feeding the first filament segment into the channel to push the second filament segment across the seam; and reversely withdrawing the first filament segment out of the channel.

Area Code: CN

Application Number: CN202111282631.3